下列协议中与Email应用无关的是（）。 A.MIME B.SMTP C.POP3

Ling ling: I'm going to England as an exchange student.
Mary: Great!
Ling ling: But I don't know much of the customs and manners in England. _____1____ .
Mary: Sure.
Ling ling: _____2____ .
Mary: Well, they think it's important to be on time when you're invited to dinner. _____3____ .
          As it is usually planned to have the meal at the exact hour given in the invitation.
Ling ling: Then how long may I stay there?
Mary: _____4____, let you seem to have come only for the meal. An evening dinner invitation
          usually implies that _____5____ . The hostess often plans some after-dinner entertainment. 
                                            

A. you stay for the whole evening B. Could you help me? C. After the neal is over, it's not polite to leave at least half an hour. D. It's impoite to arrive late. E. What rules do they have in England?

 1. _________   2. __________   3. __________   4. __________   5. __________